# PVDS¶

The PVDS table is used to define the properties of a solvent for a range of different temperature and pressures. See example below, where data is given for only one temperature:

PVDS
DATA_UNITS
PRESSURE Bar
FVF m^3/m^3
VISCOSITY cP
END
DATA
TEMPERATURE 15.0
1.013529   0.9357635 0.0080
18.250422  0.0678972 0.0096
35.487314  0.0352259 0.0112
69.961099  0.0179498 0.0140
138.908669 0.0090619 0.0189
173.382454 0.0072653 0.0208
200.00     0.0063404 0.0223
207.856239 0.0060674 0.0228
276.803809 0.0045534 0.0268
345.751379 0.0036439 0.0309
621.541659 0.0021672 0.0470
END !end TEMP block
END !end DATA
END !end PVDS

The PVDS data may contain several different pressure tables, one for each temperature. In the pressure table, column 1 is the pressure, column 2 is the solvent formation volume factor ($$B_v$$), column 3 is the solvent viscosity ($$\mu_g$$).

The pressure in column 1 must increase monotonically, and the pressure tables must be ordered for increasing temperatures. The number of pressure points given for each temperature must be the same, however the values and range of the pressure can vary. Temperature and pressure outside the given range are extrapolated. When pressure data are available for only one temperature, the properties are considered isothermal.

The default units used by this table are:

• Bar for the pressure,

• $$m^3/m^3$$ for $$B_s$$

• $$cP$$ (centipoise) for the viscosity

• C for temperature.

DATA_UNITS specifies units different than the default values, and include only the properties (in any order) for which units are needed. The temperatures can currently be entered only in degree Celsius.